Your nbn® connection box — also known as a Network Termination Device (NTD) — is the piece of equipment that connects your home to the national broadband network.

Understanding the ports and indicators on your NTD helps you set up your modem correctly and troubleshoot issues faster.

What the nbn® connection box does

The NTD is the bridge between the nbn® network outside your home and your modem inside it. It converts the signal from fibre, coaxial, or copper lines into data your modem can use.

You'll find your connection box mounted on a wall, usually near a power outlet and the point where the nbn® cable enters your premises.

There are a few versions of nbn® connection boxes, depending on your technology type — FTTP, HFC, or FTTC.

nbn® FTTP (Fibre to the Premises) connection box

The FTTP NTD is a white wall-mounted unit with four UNI-D ports and two UNI-V ports.

UNI-D (1–4): These yellow ports are used to connect your modem/router via Ethernet. Your active Ezi Broadband service will be assigned to one of these ports — usually UNI-D 1.

UNI-V (1–2): These grey ports are reserved for legacy phone services (VoIP through nbn® Co, rarely used now).

Power: This black port is for the supplied power adapter. It must remain plugged in at all times.

Fibre: This green port connects the fibre cable coming from outside your premises.

Optical light: This LED indicator shows fibre signal status. It should be solid green when active.

Tip: Always plug your modem's WAN port into the correct UNI-D port listed in your activation email. Using the wrong one will prevent connection.

nbn® HFC (Hybrid Fibre Coaxial) connection box

The HFC NTD (often branded Arris) is a small black or white unit with a coaxial input and a single Ethernet output.

Coaxial in: This cable port connects to the nbn® wall socket via a coaxial cable.

Ethernet: This yellow port connects to your modem's WAN port.

Power: This circular port is for the power adapter (must stay plugged in).

Reset: This small pinhole is used to reset the device if instructed by support.

Light indicators:

• Power — Solid green when powered.
• Downstream / Upstream — Flashing when connecting, solid when synced.
• Online — Solid green means the device is online.

Note: The HFC connection box must remain powered 24/7 — switching it off will disconnect your internet.

nbn® FTTC (Fibre to the Curb) connection device

The FTTC NCD (small grey box) connects via your phone wall socket. It powers the nbn® connection and provides Ethernet output for your modem.

DSL: Connects to the phone wall socket using the supplied cable.

LAN: Connects to your modem's WAN port.

Power: For the supplied power adapter.

Reset: Pinhole for resetting the device.

Light indicators:

• Power — On when the device is receiving power.
• Connection — Indicates link to the nbn® network.
• DSL — Lights when data is detected on the copper line.
• LAN — Solid when connected to your modem.

Tip: Always connect the FTTC device directly to the wall socket — do not use splitters or filters.

If your nbn® connection box has no lights

• Check power is connected directly to a working outlet.
• Avoid plugging into surge protectors or smart plugs that can interrupt power flow.
• If lights remain off after power cycling, contact Ezi Broadband Support for remote testing.

General safety reminders

• Do not attempt to open or relocate your nbn® box — only authorised nbn® technicians can service or move the unit.
• Always keep the area around your box dry, ventilated, and accessible.
• Never unplug your nbn® device unless advised by Ezi Broadband Support.

Need help?

1. Visit our website and speak to Eve, our AI assistant, in the bottom right corner of the screen.
2. If you'd rather chat with a human, just let Eve know and you'll be transferred to a real person within the same chat window.
3. Head over to the homepage of our help centre and submit a ticket.
4. Email us at support@ezibroadband.com.au
5. Call us on 132 EZI (132 394).